The male Black-chinned hummingbird has a black head and a strip of bright violet-purple color at the base of its neck. Its back is green and underparts are gray-white. The purple color at the throat is only noticeable in bright sunlight. The female has a green back and gray-white underparts and doesn't have the black head or purple throat markings.
Where you might see them
Black-chinned Hummingbirds are common in the western US during the summertime. Most common in canyons and along rivers, but these hummingbirds have adapted to other areas including urban environments.
The Black-chinned Hummingbird wags its tail almost constantly when it's in flight.